HELSINKI (Reuters) - Global semiconductor revenue is expected to fall 16.3 percent in 2009 to $219.2 billion after a 4.4 percent fall this year, hit by the sweeping economic downturn, research firm Gartner said on Tuesday. In mid-November Gartner had forecast for the market to fall just 2.2 percent next year. “Never before has the semiconductor industry experienced revenue declines in back-to-back